Making Relative Measurements; Recording Min/Max Temperatures - General DT8852 Manual Del Usuario

right corner of the LCD. This clock can serve as a relative time
reference for temperature measurements.

MAKING RELATIVE MEASUREMENTS

To track changes in T1 temperature over time relative to a T1
temperature at a particular time, press and hold the REL/HOLD button
at that time. In Rel mode, the primary readout will show the difference
between the real-time temperature sensed by the T1 thermocouple
and the T1 temperature when Rel mode was entered.
For example, if the value of T1 is 25°C when Rel mode is entered and
the temperature later rises to 30°C, the primary readout will show
5°C (30 – 25), accompanied by the term REL on the top line of the
LCD. If the temperature then falls to 20°C, the primary readout will
show -5°C (20 – 25).
In Rel mode, the secondary readout will continue to show the real-time
temperature sensed by the T2 thermocouple (DT8852 and DT8856 only).
To exit Rel mode and resume showing T1 on the primary readout and T2
on the secondary readout, press and hold the REL/HOLD button again.
To select a temperature unit (Fahrenheit or Celsius), use the °C/°F
button. The selected unit will appear at the right of the primary
readout.
To turn on the display backlight for 30 seconds, press the button.

RECORDING MIN/MAX TEMPERATURES

In Record mode, the DT8852, DT8855 and DT8856 continuously track
the maximum and minimum temperatures (Max and Min) sensed
through the T1 port. The instrument also notes the time at which each
temperature occurred. The two times are not referenced to an absolute
clock (as in a conventional time stamp), but rather to the time at which
Record mode was entered. The recorded times at which Max and Min
occurred can be considered relative time stamps.
To enter Record mode, briefly press the REC button. The values on the
primary and secondary readouts will not change, and will continue to
track the T1 (all three models) and T2 (DT8852 and DT8856 only)
temperatures. However, pressing the REC button 1) causes the term
REC to appear in the upper left corner of the LCD and 2) starts a
running clock with 1-second resolution in the lower right corner of the
LCD. In Record mode, all front-panel buttons except the and
buttons are disabled.
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